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Waist-to-height ratio calculator
Divide your waist by your height and see whether the ratio is under the healthy 0.5. The waist-to-height ratio calculator works in cm or inches, tells you which band you are in and shows the waist size to stay under. Free and online.
How to calculate your waist-to-height ratio
- 1Measure your waist after breathing out
- 2Enter waist and height in cm or in
- 3Read your ratio and band
- 4Check the waist size to stay under
- Your ratio, its band and the waist size to aim for.
What you get
- A clear band.From low to high risk, with the four ranges listed in a table.
- A waist target.The tool shows half your height as the waist size to keep under.
- Stays on your device.Your measurements are not sent to a server.
What you can do
- Enter waist and height in centimetres, or in inches, feet and inches.
- See the ratio with two decimals and the band it falls in: under 0.40, 0.40 to 0.49, 0.50 to 0.59 or 0.60 and up.
- Read the waist size that keeps you under 0.5, which is half your height.
Good to know
- Measure between the lowest rib and the hip bone, after breathing out.
- The bands are low (take care), healthy, increased risk and high risk. It is an estimate, not medical advice.
- The ratio does not tell you about muscle, age or build, so it is a screening number, not a diagnosis.
Questions
What is a healthy waist-to-height ratio?
Below 0.5, which means your waist is less than half your height. Under 0.40 is marked low, so take care.
How do I measure my waist?
Put the tape between your lowest rib and your hip bone and read it after a normal breath out.
How is it different from BMI?
BMI uses weight. This ratio uses waist size, so it looks at where body fat sits.
Is my data stored?
No. The calculation happens in your browser.